package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Transactional
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    AddressBookMapper addressBookMapper;
    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    OrderMapper orderMapper;
    @Autowired
    OrderDetailMapper orderDetailMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;
    @Override
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        //异常情况的处理（收货地址为空、超出配送范围、购物车为空）
        //判断地址是否为空
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null){
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        //判断购物车是否为空
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list == null || list.size() == 0){
            throw  new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //构造订单数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        //收货地址
        orders.setAddress(addressBook.getDetail());
        orders.setPhone(addressBook.getPhone());
        //收货人
        orders.setConsignee(addressBook.getConsignee());
        //订单号
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setUserId(BaseContext.getCurrentId());
        //订单状态         1、待支付
        orders.setStatus(Orders.PENDING_PAYMENT);
        //支付状态            0、未支付
        orders.setPayStatus(Orders.UN_PAID);
        //下单时间
        orders.setOrderTime(LocalDateTime.now());

        //向订单表插入1条数据
        orderMapper.insert(orders);


        //订单明细数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : list) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }

        //向明细表插入n条数据
        orderDetailMapper.insertBatch(orderDetailList);


        //封装返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .orderTime(orders.getOrderTime())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单号查询当前用户的订单
        Orders ordersDB = orderMapper.getByNumberAndUserId(outTradeNo, userId);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //////////////////////////////////////////////
        Map map = new HashMap();
        map.put("type", 1);//消息类型，1表示来单提醒
        map.put("orderId", orders.getId());
        map.put("content", "订单号：" + outTradeNo);

        //通过WebSocket实现来单提醒，向客户端浏览器推送消息
        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }

    /**
     * 历史订单
     * @param page
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult historyOrders(Integer page, Integer pageSize, Integer status) {
//        PageHelper.startPage(page,pageSize);
//        HistoryOrdersVO historyOrdersVO = new HistoryOrdersVO();
//        Page<HistoryOrdersVO> orders = orderMapper.historyOrders(page,pageSize,status);
//        historyOrdersVO.setOrders(orders);
//        orders.forEach(order ->{
//            List<OrderDetail> orderDetails = orderDetailMapper.historyOrders(order.getId());
//            historyOrdersVO.setOrderDetails(orderDetails);
//        });

//        return new PageResult(orders.getTotal(),orders.getResult());
        // 设置分页
        PageHelper.startPage(page, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        // 分页条件查询
        Page<Orders> page1 = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList();

        // 查询出订单明细，并封装入OrderVO进行响应
        if (page1 != null && page1.getTotal() > 0) {
            for (Orders orders : page1) {
                Long orderId = orders.getId();// 订单id

                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.historyOrders(orderId);

                OrderVO orderVO = new OrderVO();
                // TODO: 2023/4/26
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        return new PageResult(page1.getTotal(), list);
    }

    /**
     * 订单详情
     * @param id
     * @return
     */
    @Override
    public OrderVO orderDetail(Long id) {
        Orders orders = orderMapper.getById(id);
        List<OrderDetail> orderDetails = orderDetailMapper.historyOrders(orders.getId());
        // 将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders,orderVO);
        orderVO.setOrderDetailList(orderDetails);
        return orderVO;
    }

    /**
     * 再来一单
     * @param id
     */
    @Override
    public void repetition(Long id) {
        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetails = orderDetailMapper.historyOrders(id);
        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCarts = orderDetails.stream().map(orderDetail -> {
            ShoppingCart shoppingCart = new ShoppingCart();
            //忽略id
            BeanUtils.copyProperties(orderDetail, shoppingCart, "id");
            //将订单详情里没有的字段补充
            shoppingCart.setUserId(BaseContext.getCurrentId());
            shoppingCart.setCreateTime(LocalDateTime.now());
            return shoppingCart;
        }).collect(Collectors.toList());
        // 将购物车对象批量添加到数据库
        shoppingCarts.forEach(shoppingCart -> {
            shoppingCartMapper.insert(shoppingCart);
        });


/*        Long userId = BaseContext.getCurrentId();
        List<OrderDetail> orderDetails = orderDetailMapper.historyOrders(id);
        List<ShoppingCart> shoppingCarts= new ArrayList<>();
        orderDetails.forEach(orderDetail -> {
            shoppingCarts.forEach(shoppingCart -> {
                BeanUtils.copyProperties(orderDetail,shoppingCart,"id");
                shoppingCart.setCreateTime(LocalDateTime.now());
                shoppingCart.setUserId(userId);
                shoppingCarts.add(shoppingCart);
            });
        });
        shoppingCarts.forEach(shoppingCart -> {
            shoppingCartMapper.insert(shoppingCart);
        });
//        shoppingCartMapper.insertForEach(shoppingCarts);*/



    }

    @Override
    public void cancel(Long id) throws Exception {
        Orders order = orderMapper.getById(id);
        if (order == null){
            throw  new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (order.getStatus() > 2){
            throw  new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        // 订单处于待接单状态下取消，需要进行退款
        if (order.getStatus() == Orders.TO_BE_CONFIRMED){
            //调用微信支付退款接口
            weChatPayUtil.refund(
                    order.getNumber(), //商户订单号
                    order.getNumber(), //商户退款单号
                    new BigDecimal(0.01),//退款金额，单位 元
                    new BigDecimal(0.01)//原订单金额
            );
            order.setPayStatus(Orders.REFUND);
        }
        // 更新订单状态、取消原因、取消时间
        order.setStatus(Orders.CANCELLED);
        order.setCancelReason("用户取消");
        order.setCancelTime(LocalDateTime.now());
        orderMapper.update(order);
    }

    /**
     * 管理端分页查询
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        /*PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());
        Page<Orders> orders = orderMapper.pageQuery(ordersPageQueryDTO);
        List<OrderVO> orderVOS = new ArrayList<>();
        if (orders != null && orders.getTotal() > 0){
            orders.forEach(order -> {
                List<OrderDetail> orderDetails = orderDetailMapper.historyOrders(order.getId());
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(order,orderVO);
                orderVO.setOrderDetailList(orderDetails);
                orderVOS.add(orderVO);
            });
        }
        return new PageResult(orders.getTotal(),orderVOS);*/
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }

    /**
     * 各个状态的订单数量统计
     *
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        // 根据状态，分别查询出待接单、待派送、派送中的订单数量
        Integer count2 = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer count3 = orderMapper.countStatus(Orders.CONFIRMED);
        Integer count4 = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);
        OrderStatisticsVO build = OrderStatisticsVO.builder().confirmed(count2).toBeConfirmed(count3).deliveryInProgress(count4).build();
        return build;
    }

    /**
     * 商家接单
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(orders);
    }

    /**
     * 商家拒单
     * @param ordersRejectionDTO
     * @throws Exception
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {

        Orders orders = orderMapper.getById(ordersRejectionDTO.getId());
        //如果状态不是待接单就别不能拒单
        if (orders != null || orders.getStatus() != Orders.TO_BE_CONFIRMED){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //判断支付状态 如果已经支付需要调微信退款接口
        if (orders.getPayStatus() == Orders.PAID){
            String refund = weChatPayUtil.refund(
                    orders.getNumber(),
                    orders.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01)
            );
            log.info("申请退款：{}",refund);
        }
        // 根据订单id更新订单状态、拒单原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);

    }

    /**
     * 商家取消订单
     * @param ordersCancelDTO
     */
    @Override
    public void adminCancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());
        //如果用户已付款，需调用微信退款接口
        if (ordersDB.getPayStatus() == Orders.PAID){
            weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01)
            );
        }
        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        ordersDB.setStatus(Orders.CANCELLED);
        ordersDB.setCancelReason(ordersCancelDTO.getCancelReason());
        ordersDB.setCancelTime(LocalDateTime.now());
        orderMapper.update(ordersDB);
    }

    /**
     * 派送订单
     * @param id
     */
    @Override
    public void delivery(Long id) {
        Orders orders = orderMapper.getById(id);

        if (orders==null || orders.getStatus() == Orders.CONFIRMED){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //修改订单状态为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);
        orderMapper.update(orders);
    }

    @Override
    public void complete(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /**
     * 用户催单
     *
     * @param id
     */
    public void reminder(Long id) {
        // 查询订单是否存在
        Orders orders = orderMapper.getById(id);
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //基于WebSocket实现催单
        Map map = new HashMap();
        map.put("type", 2);//2代表用户催单
        map.put("orderId", id);
        map.put("content", "订单号：" + orders.getNumber());
        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }


    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }
    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.historyOrders(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }
}
